Going Rogue by Sarah Palin
Democracy In America
The Israel Lobby and U.S Foreign Policy by John J. Mearsheimer and Stephen M. Walt
Presidential Courage: Brave Leaders and How They changed America 1789-1989 by Michael Beschloss

I'm also expecting these books in the mail anytime:
My Life by Bill Clinton
Grand Old Party: A History of The Republicans by Lewis Gould
Party Of The People: A History Of The Democrats by Jules Witcover

Most of those are research for my PhD and a paper I'm working on. In the past, I also bought a lot of non-fiction books on art, design, films, antiques and collectibles, though I buy less books on those subjects these days, because the excellent bookshop which had coffee table books and the like at reduced prices closed and the books are less accessible for me.

Oddly enough, I have never bought political non-fiction books and almost never biographies, i.e. the kind of non-fiction that sells best aside from self-help, diet and cookbooks.

I've purchased and started to read several nonfiction books this year, which is rather rare for me.....

When the World Came to Town: 9/11 in Gander, Newfoundland
by Jim DeFede
Turning Oil into Salt: Energy Independence through Fuel Choice
by Anne Korin and Gal Luft
The Forgotten God: Reversing Our Tragic Neglect of the Holy Spirit
by Francis Chan and Danae Yankoski